HBASE-9960. Fix javadoc for CellUtil#tagsIterator()

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1541771 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9962. Improve tag iteration

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1541772 13f79535-47bb-0310-9956-ffa450edef68